Fixed headrope
The echogram will work in the area defined between where the TrawlEye is placed and the selected range.
If your TrawlEye sensor is configured for Dual Range, Fixed Headrope has two different values between brackets. With dual range, 50% of the echogram resolution is used on the first 5, 10, 15 or 20 meters; the rest of the resolution is
used on the rest of the echogram: that is 95, 90, 85 or 80 meters.